• The post-WW2 transition to liberal democracy in Germany, Italy (Adenauer and De Gasperi): Adenauer and De Gasperi were the leaders of the respective christian-democratic parties and led the transition of their countries away from 2 of the worst dictatorships humankind has ever seen
• ending apartheid in South Africa: F. W. De Klerk was South Africa’s last apartheid president and although he represented the party which created apartheid, he acted as a centrist. He sidelined the far right wings of his party, released Nelson Mandela’s and ended the system. Nelson Mandela also adopted pretty reconciliatory policies once he became president.
• 1991 economic reforms in India: the centrist Indian National Congress party adopted sweeping reforms that enabled India to face the crisis it was going through and speed up its GDP per capita growth.

I don’t have time to finish but you can easily find more information about the rest in any contemporary history textbook or on the internet.